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|
/*
+----------------------------------------------------------------------+
| Yet Another Cache |
+----------------------------------------------------------------------+
| Copyright (c) 2013-2013 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Xinchen Hui <laruence@php.net> |
+----------------------------------------------------------------------+
*/
#include "storage/yac_storage.h"
#include "storage/allocator/yac_allocator.h"
#ifdef USE_SHM
#if defined(__FreeBSD__)
# include <machine/param.h>
#endif
#include <sys/types.h>
#include <sys/shm.h>
#include <sys/ipc.h>
#include <dirent.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
typedef struct {
yac_shared_segment common;
int shm_id;
} yac_shared_segment_shm;
static int create_segments(size_t k_size, size_t v_size, yac_shared_segment_shm **shared_segments_p, int *shared_segments_count, char **error_in) /* {{{ */ {
struct shmid_ds sds;
int shm_id, shmget_flags;
yac_shared_segment_shm *shared_segments, first_segment;
unsigned int i, j, allocate_size, allocated_num, segments_num, segment_size;
shmget_flags = IPC_CREAT|SHM_R|SHM_W|IPC_EXCL;
segments_num = 1024;
while ((v_size / segments_num) < YAC_SMM_SEGMENT_MIN_SIZE) {
segments_num >>= 1;
}
segment_size = v_size / segments_num;
allocate_size = YAC_SMM_SEGMENT_MAX_SIZE;
while ((shm_id = shmget(IPC_PRIVATE, allocate_size, shmget_flags)) < 0) {
allocate_size >>= 1;
}
if (shm_id < 0) {
/* this should never happen */
*error_in = "shmget";
return 0;
}
if (allocate_size < YAC_SMM_SEGMENT_MIN_SIZE) {
/* this should never happen */
*error_in = "shmget";
return 0;
}
if (k_size <= allocate_size) {
first_segment.shm_id = shm_id;
first_segment.common.pos = 0;
first_segment.common.size = allocate_size;
first_segment.common.p = shmat(shm_id, NULL, 0);
shmctl(shm_id, IPC_RMID, &sds);
if (first_segment.common.p == (void *)-1) {
*error_in = "shmat";
return 0;
}
} else {
shmctl(shm_id, IPC_RMID, &sds);
*error_in = "shmget";
return 0;
}
allocated_num = (v_size % allocate_size)? (v_size / allocate_size) + 1 : (v_size / allocate_size);
shared_segments = (yac_shared_segment_shm *)calloc(1, (allocated_num) * sizeof(yac_shared_segment_shm));
if (!shared_segments) {
*error_in = "calloc";
return 0;
}
for (i = 0; i < allocated_num; i ++) {
shm_id = shmget(IPC_PRIVATE, allocate_size, shmget_flags);
if (shm_id == -1) {
*error_in = "shmget";
for (j = 0; j < i; j++) {
shmdt(shared_segments[j].common.p);
}
free(shared_segments);
return 0;
}
shared_segments[i].shm_id = shm_id;
shared_segments[i].common.pos = 0;
shared_segments[i].common.size = allocate_size;
shared_segments[i].common.p = shmat(shm_id, NULL, 0);
shmctl(shm_id, IPC_RMID, &sds);
if (shared_segments[i].common.p == (void *)-1) {
*error_in = "shmat";
for (j = 0; j < i; j++) {
shmdt(shared_segments[j].common.p);
}
free(shared_segments);
return 0;
}
}
++segments_num;
*shared_segments_p = (yac_shared_segment_shm *)calloc(1, segments_num * sizeof(yac_shared_segment_shm));
if (!*shared_segments_p) {
free(shared_segments);
*error_in = "calloc";
return 0;
} else {
*shared_segments_p[0] = first_segment;
}
*shared_segments_count = segments_num;
j = 0;
for (i = 1; i < segments_num; i++) {
if (shared_segments[j].common.pos == 0) {
(*shared_segments_p)[i].shm_id = shared_segments[j].shm_id;
}
if ((shared_segments[j].common.size - shared_segments[j].common.pos) >= (2 * YAC_SMM_ALIGNED_SIZE(segment_size))) {
(*shared_segments_p)[i].common.pos = 0;
(*shared_segments_p)[i].common.size = YAC_SMM_ALIGNED_SIZE(segment_size);
(*shared_segments_p)[i].common.p = shared_segments[j].common.p + YAC_SMM_ALIGNED_SIZE(shared_segments[j].common.pos);
shared_segments[j].common.pos += YAC_SMM_ALIGNED_SIZE(segment_size);
} else {
(*shared_segments_p)[i].common.pos = 0;
(*shared_segments_p)[i].common.size = shared_segments[j].common.size - shared_segments[j].common.pos;
(*shared_segments_p)[i].common.p = shared_segments[j].common.p + YAC_SMM_ALIGNED_SIZE(shared_segments[j].common.pos);
j++;
}
}
free(shared_segments);
return 1;
}
/* }}} */
static int detach_segment(yac_shared_segment_shm *shared_segment) /* {{{ */ {
if (shared_segment->shm_id) {
shmdt(shared_segment->common.p);
}
return 1;
}
/* }}} */
static size_t segment_type_size(void) /* {{{ */ {
return sizeof(yac_shared_segment_shm);
}
/* }}} */
yac_shared_memory_handlers yac_alloc_shm_handlers = /* {{{ */ {
(create_segments_t)create_segments,
(detach_segment_t)detach_segment,
segment_type_size
};
/* }}} */
#endif /* USE_SHM */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
|
